| 31. | When a peripheral fiber is severed, the myelin sheath provides a track along which regrowth can occur.
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| 32. | The thickness of the myelin sheath on motor neurons determines how quickly electrical impulses travel along them.
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| 33. | There is still a myelin sheath present-just in far lower amounts compared to the white ramus communicans.
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| 34. | Each arm reaches out to a nerve fiber and spirals around it, creating a myelin sheath.
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| 35. | A myelin sheath is a lipid protective coating that covers and protects nerve cells ( axons ).
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| 36. | Schwann cells are the cells in the peripheral nervous system that create and maintain myelin sheaths on neurons.
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| 37. | In 1838, Theodor Schwann began studying white and grey matter in the brain, and discovered the myelin sheath.
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| 38. | Researchers in New York have successfully cured leukodystrophy in mice, using skin cells to repair damaged myelin sheaths.
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| 39. | The disease involves an enzyme deficiency that causes the myelin sheath surrounding nerves to the brain to degenerate.
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| 40. | The myelin sheath of long nerves was discovered and named by German histologists of the late 19th century.
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